I got one from Guy Baker...you have to replace the whole piece, not just the rubber part, but you don't have to replace the whole motor.
Problem tho. The friction wheel that Guy sent me (I got it Friday) doesn't have the notch for the winder belt, so I have to call him tomorrow.
When I get home, I'll PM you his phone number...he doesn't much like emails...he responds to them with a phone call.

The friction wheels the I have come in several sizes and if the pulley in front of yours is separate I should have what you need here.

Billy